今天下午捣鼓了一下小应用，使用老赵的jscex给mongoose添加了Async 同步方法，感觉还不错，至少对我来说相当节省开发效率，分享一下。

给mongoose添加jscex的方法很简单，只需要使用老赵的 ”Jscex异步增强模块“进行异步操作绑定即可，什么是”Jscex异步增强模块“在此我就不缀述了，感兴趣的同学直接访问 Jscex异步增强模块 即可。这里仅贴出mongoose的异步操作绑定代码，代码比较简单，就不一一说明了。

先贴一个加载异步增强模块的代码，我事先用npm安装了jscex，命令如下” npm install jscex jscex-jit jscex-async”，详细请看赵姐夫的说明，链接地址：https://github.com/JeffreyZhao/jscex/blob/master/README-cn.md

<pre> var Jscex = require(“jscex”);

require(“jscex-jit”).init(Jscex); require(“jscex-async”).init(Jscex); require("./jscex-async-powerpack").init(Jscex);

module.exports = Jscex; </pre>

有了jscex，剩下就是加语法糖的代码了，只需做个简单的绑定

<pre> var mongoose = require(‘mongoose’), Jscex = require(’…/plugins/jscex-start’), Model = mongoose.Model;

var Async = Jscex.Async; var Task = Async.Task; var Jscexify = Async.Jscexify;

//真坑爹，mardown居然有小于号就显示不正确 var addSugarMethods = function(methods , obj){ for(var i = 0,len = methods.length; i 小于 len ; i++){ if(obj[methods[i]]) obj[methods[i] + ‘Async’] = Jscexify.fromStandard(obj[methods[i]]); } }

module.exports = { init : function(){ addSugarMethods([‘save’,‘remove’],Model.prototype); }, model : function(name ,schema){ mongoose.model(name, schema); var methods = [‘find’,‘remove’,‘findById’,‘findOne’,‘count’,‘distinct’,‘create’,‘update’]; var model = mongoose.model(name); addSugarMethods(methods,model); } }

</pre>

好了，下面以node-club源码里的User 对象做个例子测试一下

<pre> var mongoose = require(‘mongoose’); var Schema = mongoose.Schema; var modelAsync = require(’./modelAsync’);

var UserSchema = new Schema({ //用户昵称 name: { type: String, index: true },
//用户登录名称:唯一 loginname: { type: String }, //登录密码 pass: { type: String }, //邮箱 email: { type: String }, //个人主页 url: { type: String }, //住址 location: { type: String }, //个性签名 signature: { type: String }, //个人简介 profile: { type: String }, //微薄 weibo: { type: String }, //头像 avatar: { type: String }, //被关注的人数 follower_count: { type: Number, default: 0 }, //关注的人数 following_count: { type: Number, default: 0 }, //创建时间 create_at: { type: Date, default: Date.now }, //更新时间 update_at: { type: Date, default: Date.now }, //是否活动状态 active: { type: Boolean, default: true } });

modelAsync.model(‘User’, UserSchema); </pre>

----------------------分割线----------------------------------

<pre> var mongoose = require(‘mongoose’), config= require(’…/config’).config, modelAsync = require(’./modelAsync’);

modelAsync.init();

mongoose.connect(config.db, function(err){ if(err){ console.log('connect to db error: ’ + err.message); process.exit(1); } });

// models require(’./user’);

exports.User = mongoose.model(‘User’); </pre>

上面代码取自node-club里的源码，至此就可以用同步的写法去获取数据了，测试代码如下

<pre> var models = require(’…/…/models’), User = models.User, should = require(‘should’), Jscex = require(’…/…/plugins/jscex-start’);

module.exports = {

‘test updating documents async’: function () {

    var saveUserAsync = eval(Jscex.compile("async", function (user) {
        $await(user.saveAsync());
        var _user = $await(User.findAsync({ _id : user._id }));
        should.exist(_user);
        _user.should.have.length(1);
    }));

    var user = new User();

    user.name      = 'flyhuang';
    user.loginname = 'hpf1908';
    user.pass      = '123456';
    user.email     = 'hpf1908[@gmail](/user/gmail).com';

    var task = saveUserAsync(user);
    task.start();
},
'test delete documents async' : function(){

    var removeUserAsync = eval(Jscex.compile("async", function (user) {
        $await(user.saveAsync());
        $await(User.removeAsync({ name : user.name }));
        var _user = $await(User.findAsync({ name : user.name }));
        _user.should.be.empty;
    }));

    var user = new User();

    user.name      = 'flyhuang';
    user.loginname = 'hpf1908';
    user.pass      = '123456';
    user.email     = 'hpf1908[@gmail](/user/gmail).com';

    var task = removeUserAsync(user);
    task.start();
}

} </pre>

看上面的例子是否觉得同步写法更简明易懂了？当然如果你不喜欢这样的写法也可以继续使用异步的方式，再贴一个用异步写法的例子，以作对比

<pre> var models = require(’…/…/models’), User = models.User, should = require(‘should’);

module.exports = {

‘test updating documents’: function () {

    var user = new User();

    user.name      = 'flyhuang';
    user.loginname = 'hpf1908';
    user.pass      = '123456';
    user.email     = 'hpf1908[@gmail](/user/gmail).com';

    user.save(function (err) {
        should.strictEqual(err, null);
        User.find({ _id : user._id },function(err , user){
            should.strictEqual(err, null);
            should.exist(user);
            user.should.have.length(1);

            console.log('done');
        });
    });
},
'test delete documents' : function(){
    var user = new User();

    user.name      = 'flyhuang';
    user.loginname = 'hpf1908';
    user.pass      = '123456';
    user.email     = 'hpf1908[@gmail](/user/gmail).com';

    user.save(function (err) {
        should.strictEqual(err, null);
        User.remove({ name : 'flyhuang' },function(err ){
            should.strictEqual(err, null);
            User.find({ name : 'flyhuang'},function(err , user){
                should.strictEqual(err, null);
                user.should.be.empty;
                console.log('done');
            });
        });
    });
}

} </pre>